<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主题区域 -->
    <el-container>
      <!-- 侧边栏区域 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单 -->
        <el-menu
          background-color="#373d41"
          text-color="#fff"
          active-text-color="#409EFF"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition='false'
          router
          :default-active="activePath"
        >
          <!-- 一级菜单 -->
          <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单模板区 -->
            <template slot="title">
              <!-- 图标 -->
              <i class="el-icon-location"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)"
              ><template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
              </template></el-menu-item
            >
          </el-submenu>
        </el-menu></el-aside
      >
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data(){
    return{
      // 左侧菜单
      menulist:[],
      // 是否折叠
      isCollapse:false,
      // 被激活的链接地址
      activePath:'',

    }
  },
  created() {
    this.getMenuList()
    this.activePath=window.sessionStorage.getItem('activePath')
  },
  methods: {
    // 退出功能
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
   async getMenuList() {
    const {data:res} =await this.$http.get('menus')
    if(res.meta.status!==200) return this.$message.error(res.meta.msg)
    this.menulist=res.data

    },
    // 点击按钮，切换菜单的折叠
    toggleCollapse(){
      this.isCollapse=!this.isCollapse
    },
    // 保存链接激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem("activePath",activePath)
      this.activePath=activePath
    }
  }
}
</script>

<style lang="less" scoped>
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu{
    border: none;
  }
}
.el-emain {
  background-color: #eaedf1;
}
.home-container {
  height: 100%;
}
.toggle-button{
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
